US3972467A - Paper-board laminate - Google Patents

Paper-board laminate Download PDF

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Publication number
US3972467A
US3972467A US05/495,253 US49525374A US3972467A US 3972467 A US3972467 A US 3972467A US 49525374 A US49525374 A US 49525374A US 3972467 A US3972467 A US 3972467A
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US
United States
Prior art keywords
layer
inches
thickness
laminate
bonded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/495,253
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English (en)
Inventor
Allan A. Whillock
James Wesley Yount
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Paper Co
Original Assignee
International Paper Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Paper Co filed Critical International Paper Co
Priority to US05/495,253 priority Critical patent/US3972467A/en
Priority to CA222,437A priority patent/CA1046392A/en
Priority to ZA00754564A priority patent/ZA754564B/xx
Priority to NL7508641A priority patent/NL7508641A/xx
Priority to AU83423/75A priority patent/AU489212B2/en
Priority to BE158852A priority patent/BE832009A/xx
Priority to GB32226/75A priority patent/GB1518302A/en
Priority to LU73147A priority patent/LU73147A1/xx
Priority to SE7508811A priority patent/SE7508811L/xx
Priority to JP50095351A priority patent/JPS5141078A/ja
Priority to MX100049U priority patent/MX3450E/es
Priority to NO752745A priority patent/NO752745L/no
Priority to DE19752534873 priority patent/DE2534873A1/de
Priority to FI752226A priority patent/FI752226A7/fi
Priority to FR7524551A priority patent/FR2281218A1/fr
Priority to BR7505022*A priority patent/BR7505022A/pt
Priority to DK357875A priority patent/DK357875A/da
Application granted granted Critical
Publication of US3972467A publication Critical patent/US3972467A/en
Priority to CA299,664A priority patent/CA1050872A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/24—Layered products comprising a layer of synthetic resin characterised by the use of special additives using solvents or swelling agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/24—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2377/00—Polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y10T428/24959—Thickness [relative or absolute] of adhesive layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
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    • Y10T428/24967—Absolute thicknesses specified
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31678—Of metal
    • Y10T428/31692—Next to addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31725—Of polyamide
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31743—Next to addition polymer from unsaturated monomer[s]
    • Y10T428/31746—Polymer of monoethylenically unsaturated hydrocarbon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31971—Of carbohydrate
    • Y10T428/31993—Of paper

Definitions

  • This invention relates to coated, paperboard containers and in particular to containers for packaging and storing materials which are prone to leak from the containers or to damage the paperboard by seeping through minor cuts and imperfections in the coating on the paperboard.
  • Paperboard containers for a great variety of foods and beverages have become widely known and utilized.
  • containers such as those disclosed in U.S. Pat. No. 2,750,095 have been employed for holding perishable foods for relatively short periods of time, on the order of about two weeks.
  • Such containers have found wide applicability for beverages, such as milk and orange juice.
  • Such containers have been assembled from a paperboard blank, coated on both sides with one or more layers of a protective, thermoplastic material, such as polyethylene.
  • a protective, thermoplastic material such as polyethylene.
  • wicking occurs principally at certain sites, inside the containers. Usually, such sites are where the paperboard material has been scored, folded and/or flexed in forming blanks for containers, folding the blanks along the score lines to form the containers, or in filling, closing or storing the containers.
  • sites are where the paperboard material has been scored, folded and/or flexed in forming blanks for containers, folding the blanks along the score lines to form the containers, or in filling, closing or storing the containers.
  • soft drink syrups it has been noted that almost any damage to the coating material on the inside surface of the containers can result in rapid and disastrous penetration of the paperboard base stock by the syrup.
  • coated laminates of paperboard and aluminum foil have been utilized. See, for example, U.S. Pat. No. 3,365,111.
  • the aluminum foil when bonded to the paperboard, has been found to enhance the durability of the resulting containers by inhibiting the liquid or syrup contents from penetrating the paperboard base stock. More importantly, the aluminum foil has served as an effective barrier against both the inflow and outflow of gases and liquids, thereby minimizing the deterioration of the contents of the containers over prolonged periods.
  • Aluminum foil-paperboard laminated have not, however, been entirely satisfactory for some fill products.
  • the containers made from such laminates have still been prone to wicking through score cuts, breaks or defects in the thermoplastic material and aluminum foil into the paperboard base stock, particularly over extended periods of time. Although the amount of wicking has been reduced with such laminates, the problem has continued to be a significant one when the containers have been used for some fill products over periods of about 2 months or more.
  • an improved laminate for a container for liquids, syrups and pastes, which comprises a layer of a paperboard base stock, a layer of a thermoplastic material bonded to one surface of the paperboard base stock, a layer of a high strengh polymer film bonded on one of its surfaces to the other surface of the paperboard base stock, and a second layer of a thermoplastic material bonded to the other surface of the polymer film.
  • the improved laminate for a container of this application is provided with a layer of aluminum foil bonded to one of the surfaces of the layer of a polymer film.
  • the improved laminate of this application a material is provided having improved strength, durability, resistance to cuts, cracks and pin holes, as well as improved barrier properties.
  • This laminate is also adapted to be cut and scored on conventional process equipment into blanks for paperboard containers. The laminate is therefore well suited for use in inexpensive, disposable, coated, paperboard containers to substantially reduce the tendency of the containers to fail, due to the wicking of their contents over extended periods of time.
  • FIG. 1 is a schematic, cross-sectional view of a laminate in accordance with an embodiment of this invention.
  • FIG. 2 is a schematic, cross-sectional view of a second embodiment of a laminate in accordance with this invention, which includes an aluminum foil layer.
  • FIG. 1 Shown in FIG. 1 is a multi-layer laminate 10 which comprises a first layer of a thermoplastic material 11; a layer of a paperboard base stock 12; a laminating layer 13; a layer of a high strength polymer film 14; and a second layer of a thermoplastic material 15.
  • the first thermoplastic layer 11 is bonded to one surface of the paperboard base stock 12, and the laminating layer 13 is bonded to the other surface of the paperboard base stock 12.
  • the laminating layer 13 is also bonded to one surface of the layer of a polymer film 14, and the second thermoplastic layer 15 is bonded to the other surface of the layer of a polymer film 14.
  • the first thermoplastic layer 11 and the second thermoplastic layer 15 can be formed from any thermoplastic material conventionally utilized on the inner or outer surfaces of coated, paperboard containers.
  • thermoplastic materials which can be utilized are the polyolefins, such as are disclosed in U.S. Pat. No. 3,423,341, e.g., polyethylene and polypropylene; the ethylene-acrylic acid copolymers, such as are described in U.S. Pat. No. 3,423,231; and the Surlyn ionic copolymers, such as are disclosed in U.S. Pat. No. 3,791,915.
  • the preferred thermoplastic materials for the first and second thermoplastic layers 11 and 15 are the polyolefins, particularly low density polyethylene.
  • the thickness of the first thermoplastic layer 11 and of the second thermoplastic layer 15 is not critical, and any thickness greater than about 0.0005 inches, sufficient to enable a heat-sealed bond to be formed between the two layers, can be suitably utilized.
  • the thickness of the first and second thermoplastic layers 11 and 15 is from about 0.0005 inches to about 0.0020 inches.
  • a particularly preferred thickness for the first thermoplastic layer, as an outside coating for a container, is about 0.00075 inches
  • a particularly preferred thickness for the second thermoplastic layer, as an inside coating for a container is about 0.0015 inches.
  • any conventional, high strength polymer film having a tensile strength at the yield point of greater than about 4,000 p.s.i. and an elongation at fracture of greater than about 200% can be utilized for the polymer film layer 14.
  • the materials which can be suitably utilized for forming the polymer film layer 14 are the synthetic linear polyamides, i.e., the nylons, preferably nylon-6, nylon-6,6, nylon-6,10 and copolymers of these nylons.
  • the preferred materials for the polymer film layer 14 are the nylons, especially the nylons coated on a surface with an additional gas barrier material, such as saran, i.e., polyvinylidene chloride.
  • a particularly preferred nylon is a saran coated nylon 6 film, available under the trade name Capran 70K from Allied Chemical Corporation, Morristown, New Jersey.
  • the polymer film layer 14 can be treated, if desired, to promote its adhesion to the laminating layer 13 or to the second thermoplastic layer 15.
  • the selection of the treatment to promote adhesion and the amount of treatment utilized are not critical.
  • adhesion can be promoted by applying to a surface of the film an adhesion primer, such as the polyalkylene imines or the urethane based materials disclosed in U.S. Pat. No. 3,570,748, in an amount sufficient to assure that the nylon film layer is bonded to the second thermoplastic layer 15 or to the laminating layer 13.
  • a preferred method of promoting adhesion of a nylon film layer 14 is by electrostatically treating one or both surfaces thereof.
  • a nylon film layer 14 is preferably treated to promote adhesion. It is particularly preferred that a barrier coated nylon film layer 14 be electrostatically treated on its uncoated surface and that it be treated with an adhesion primer on its coated surface to assure adhesion of both surfaces to the polyolefin laminating layer 13 and the polyolefin second thermoplastic layer 15.
  • a suitable adhesion primer for bonding the coated surface of the nylon film layer 14 to the polyolefin second thermoplastic layer 15 or to the polyolefin laminating layer 13 is an ethylene-acrylic acid copolymer, such as is available under the trade name Adcote 50 C12 from Morton Chemical Company of Chicago, Illinois. This adhesion primer is preferably applied to the nylon film layer 14 in an amount of at least 1/4 pound, preferably 1/2 to 1 pound, per 3,000 sq. ft. of paperboard base stock 12.
  • the thickness of the layer of the high strength polymer film 14 is not critical, and any thickness between about 0.0003 inches and 0.0015 inches can be suitably utilized.
  • the polymer film layer 14 is a nylon having a thickness of about 0.0004 to about 0.0010 inches, particularly about 0.0006 inches.
  • any paperboard base stock conventionally utilized in coated, paperboard containers can be utilized in the paperboard base stock layer 12.
  • the paperboard base stock has a basis weight of from about 150 pounds to about 400 pounds per 3,000 sq. ft. and a thickness of about 0.010 inches to about 0.030 inches.
  • a paperboard base stock of about 300 to 335 pounds per 3,000 sq. ft. and of about 0.024 to about 0.028 inches thickness be utilized, particularly a paperboard base stock having a weight of about 327 pounds per 3,000 sq. ft. and a thickness of about 0.026 inches.
  • paperboard base stocks of greater or lesser weights and thicknesses than the foregoing are especially preferred.
  • a paperboard base stock of about 180 to 250 pounds per 3000 sq. ft. and of about 0.013 to about 0.019 inches thickness is especially preferred.
  • the laminating layer 13 can be any conventional material for bonding a layer of a polymer film to a layer of paperboard.
  • the preferred materials for the laminating layer 13 are the thermoplastic materials, such as the thermoplastic materials described above for the first and second thermoplastic layers 11 and 15, especially the polyolefins, particularly low density polyethylene.
  • other adhesive materials such as the two component laminating adhesive available under the tradename Adcote 503 from Morton Chemical Co., Chicago, Illinois, can be utilized in the layer 13 for laminating the polymer film layer 14 to the paperboard layer 12.
  • the thickness of the laminating layer 13 is not critical, but rather will depend upon the type of material used in the laminating layer.
  • any thickness from about 0.0003 inches to about 0.0020 inches can be suitably utilized, with about 0.0010 inches being preferred.
  • the laminating layer 13 can be dispensed with entirely by extruding or otherwise applying the polymer film layer 14 directly on to the surface of the paperboard base stock 12.
  • the layer of paperboard base stock 12, the polymer film layer 14 and the first and second thermoplastic layers 11 and 15 combine to provide a laminate having superior strength and durability, resistance to cuts, cracks and the formation of pin holes, as well as improved barrier properties, but which is nevertheless suitable for cutting and scoring into container blanks on conventional process equipment.
  • the laminate 10 is well suited for use in containers for holding and storing liquids, syrups and pastes of various comestibles, such as milk, soft drink concentrates, juices, juice concentrates and mustard, over extended periods of time.
  • the multi-layer laminate 20 in FIG. 2 comprises: a first layer of a thermoplastic material 21; a layer of a paperboard base stock 22; a first laminating layer 23; a layer of a high strength polymer film 24; a second laminating layer 25; a layer of aluminum foil 26; and a second layer of a thermoplastic material 27.
  • the first thermoplastic layer 21 is bonded to one surface of the paperboard base stock 22, and the first laminating layer 23 is bonded to the other surface of the paperboard base stock 22.
  • the first and second laminating layers 23 and 25 are bonded to the surfaces of the polymer film layer 24.
  • the second laminating layer 25 and the second thermoplastic layer 27 are bonded to the surfaces of the aluminum foil 26.
  • the first thermoplastic layer 21 and the second thermoplastic layer 27 can be formed from any thermoplastic material conventionally utilized for coating the inside or the outside surfaces of paperboard containers.
  • the first and second thermoplastic layers 21 and 27 are preferably the same as the first and second thermoplastic layers 11 and 15 in the multi-layer laminate 10, described above.
  • the layer of paperboard base stock 22 in the laminate 20 can be any paperboard base stock conventionally utilized in coated, paperboard containers.
  • the paperboard base stock 22 in the multi-layer laminate 20 is the same as the paperboard base stock 12 in the multi-layer laminate 10, described above.
  • the layer of a high strength polymer film 24 in the laminate 20 can be any conventional polymer film having a tensile strength at the yield point of greater than about 4000 p.s.i. and an elongation at fracture of greater than about 200%, such as the high strength polymer films described above for the layer 14 of the laminate 10.
  • the preferred polymer films for the layer 24 are the nylon films described above in connection with the polymer film layer 14 in the laminate 10.
  • the first laminating layer 23 can be any conventional adhesive material adapted to bond the layer of a polymer film 24 to the layer of the paperboard base stock 22, and the second laminating layer 25 can be any conventional adhesive material adapted to bond the layer of aluminum foil 26 to the polymer film layer 24.
  • the first laminating layer 23 is the same material as the laminating layer 13 in the laminate 10, described above, especially the polyolefins, particularly polyethylene.
  • the second laminating layer 25 is also preferably the same material as the laminating layer 13 in the laminate 10, especially a polyolefin, particularly polyethylene.
  • either one or both of the first and second laminating layers may be eliminated entirely by extruding or otherwise applying the polymer film layer 24 directly on to a surface of one or both of the paperboard base stock 22 and aluminum foil 26.
  • the layer of aluminum foil 26 in the multi-layer laminate 20 can be of any thickness conventionally utilized in paperboard containers, such as are described in U.S. Pat. No. 3,365,111.
  • the aluminum foil has a thickness of from about 0.00025 to about 0.001 inches, especially a thickness of about 0.00035 inches.
  • the layer of paperboard base stock 22, the layer of a high strength polymer film 24, the layer of the aluminum foil 26 and the first and second layers of thermoplastic materials 21 and 27 provide a laminate material 20 having superior strength and durability, resistance to cuts, cracks and pin holes, as well as superior barrier properties with regard to penetration by liquids and gases, but which is nevertheless suitable for cutting and scoring into container blanks on conventional process equipment. Because of its superior properties, the laminate 20 is very well suited for use in containers for holding and storing liquids, syrups and pastes of various comestibles, such as juices, soft drink syrups, particularly diet soft drink syrups, juice concentrates and the like.
  • the layer of a polymer film 14 be positioned interiorly of the layer of the paperboard base stock 12 in a container made of laminate 10.
  • the polymer film layer 14 can also be located exteriorly of the paperboard stock 12 or, alternatively, polymer film layers can be provided both interiorly and exteriorly of the paperboard base stock in a container.
  • the layer of aluminum foil 26 be located interiorly of the layer of a polymer film 24 and that both the polymer film layer and the aluminum foil layer be located interiorly of the layer of paperboard base stock 22 in a container.
  • the polymer film layer 24 or the layer of aluminum foil 26 or both may be located exteriorly of the layer of paperboard base stock 22 or layers of a polymer film and aluminum foil may be located both interiorly and exteriorly of the layer of paperboard base stock in a container constructed from the laminate 20.

Landscapes

  • Laminated Bodies (AREA)
  • Paper (AREA)
  • Wrappers (AREA)
US05/495,253 1974-08-06 1974-08-06 Paper-board laminate Expired - Lifetime US3972467A (en)

Priority Applications (18)

Application Number Priority Date Filing Date Title
US05/495,253 US3972467A (en) 1974-08-06 1974-08-06 Paper-board laminate
CA222,437A CA1046392A (en) 1974-08-06 1975-03-18 Paperboard laminate
ZA00754564A ZA754564B (en) 1974-08-06 1975-07-16 Paperboard laminate
NL7508641A NL7508641A (nl) 1974-08-06 1975-07-18 Kartonlaminaat.
AU83423/75A AU489212B2 (en) 1974-08-06 1975-07-28 Paperboard laminate
BE158852A BE832009A (fr) 1974-08-06 1975-07-31 Stratifie a ame en carton et recipients formes avec ce stratifie
GB32226/75A GB1518302A (en) 1974-08-06 1975-08-01 Paperboard-plastics laminate
LU73147A LU73147A1 (enrdf_load_stackoverflow) 1974-08-06 1975-08-04
SE7508811A SE7508811L (sv) 1974-08-06 1975-08-05 Kartonglaminat.
MX100049U MX3450E (es) 1974-08-06 1975-08-05 Laminado de carton mejorado
NO752745A NO752745L (enrdf_load_stackoverflow) 1974-08-06 1975-08-05
DE19752534873 DE2534873A1 (de) 1974-08-06 1975-08-05 Mehrschichtenwerkstoff und daraus hergestellte behaelter
FI752226A FI752226A7 (enrdf_load_stackoverflow) 1974-08-06 1975-08-05
JP50095351A JPS5141078A (enrdf_load_stackoverflow) 1974-08-06 1975-08-05
FR7524551A FR2281218A1 (fr) 1974-08-06 1975-08-06 Stratifie a ame en carton et recipients formes avec ce stratifie
BR7505022*A BR7505022A (pt) 1974-08-06 1975-08-06 Papelao em forma laminada e recipiente composto do mesmo
DK357875A DK357875A (da) 1974-08-06 1975-08-06 Kartonlaminat
CA299,664A CA1050872A (en) 1974-08-06 1978-03-23 Paperboard laminate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/495,253 US3972467A (en) 1974-08-06 1974-08-06 Paper-board laminate

Publications (1)

Publication Number Publication Date
US3972467A true US3972467A (en) 1976-08-03

Family

ID=23967907

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/495,253 Expired - Lifetime US3972467A (en) 1974-08-06 1974-08-06 Paper-board laminate

Country Status (16)

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US (1) US3972467A (enrdf_load_stackoverflow)
JP (1) JPS5141078A (enrdf_load_stackoverflow)
BE (1) BE832009A (enrdf_load_stackoverflow)
BR (1) BR7505022A (enrdf_load_stackoverflow)
CA (1) CA1046392A (enrdf_load_stackoverflow)
DE (1) DE2534873A1 (enrdf_load_stackoverflow)
DK (1) DK357875A (enrdf_load_stackoverflow)
FI (1) FI752226A7 (enrdf_load_stackoverflow)
FR (1) FR2281218A1 (enrdf_load_stackoverflow)
GB (1) GB1518302A (enrdf_load_stackoverflow)
LU (1) LU73147A1 (enrdf_load_stackoverflow)
MX (1) MX3450E (enrdf_load_stackoverflow)
NL (1) NL7508641A (enrdf_load_stackoverflow)
NO (1) NO752745L (enrdf_load_stackoverflow)
SE (1) SE7508811L (enrdf_load_stackoverflow)
ZA (1) ZA754564B (enrdf_load_stackoverflow)

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DE2909998A1 (de) * 1978-03-14 1979-09-27 Raymond Wing Jean Abdeckungsmaterial fuer waende, decken o.dgl.
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US4455184A (en) * 1980-09-10 1984-06-19 Champion International Corporation Production of laminate polyester and paperboard
US4395453A (en) * 1981-09-11 1983-07-26 Olin Corporation Fire and heat resistant structure
US4396142A (en) * 1981-09-11 1983-08-02 Olin Corporation Fire and heat resistant structure
US4405076A (en) * 1981-09-11 1983-09-20 Olin Corporation Fire and heat resistant structure
US4525396A (en) * 1982-08-13 1985-06-25 Asahi Kasei Kogyo Kabushiki Kaisha Pressure-resistant paper vessel
US4489112A (en) * 1983-03-28 1984-12-18 Ex-Cell-O Corporation Laminated paperboard container with absorption resistance means, and blank for constructing same
US4537815A (en) * 1983-03-28 1985-08-27 Ex-Cell-O Corporation Laminated paperboard container with absorption resistance means, and blank for constructing same
AU567152B2 (en) * 1983-03-28 1987-11-12 Ex-Cell-O Corporation Carton with absorption resistance layer
US4590126A (en) * 1983-10-05 1986-05-20 Tetra Pak International Ab Packing laminate
US4513036A (en) * 1983-10-17 1985-04-23 Champion International Corporation Barrier laminates for containment of essential oils and flavors and cartons made therefrom
US4583679A (en) * 1984-01-17 1986-04-22 Manville Service Corporation Resealable paperboard package
US4595119A (en) * 1984-06-22 1986-06-17 Cho Choong M Water proof paper canister
US4753832A (en) * 1985-09-10 1988-06-28 The Procter & Gamble Company Barrier laminates for the retention of essential oils, vitamins and flavors in citrus beverages and a method of making said laminate and leak-tight containers therefrom
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LU73147A1 (enrdf_load_stackoverflow) 1977-01-07
FR2281218A1 (fr) 1976-03-05
CA1046392A (en) 1979-01-16
DK357875A (da) 1976-02-07
MX3450E (es) 1980-12-02
NO752745L (enrdf_load_stackoverflow) 1976-02-09
FR2281218B1 (enrdf_load_stackoverflow) 1979-05-11
FI752226A7 (enrdf_load_stackoverflow) 1976-02-07
BE832009A (fr) 1976-02-02
DE2534873A1 (de) 1976-02-19
NL7508641A (nl) 1976-02-10
AU8342375A (en) 1977-02-03
GB1518302A (en) 1978-07-19
BR7505022A (pt) 1976-08-03
SE7508811L (sv) 1976-02-09
ZA754564B (en) 1976-06-30
JPS5141078A (enrdf_load_stackoverflow) 1976-04-06

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